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authorMike Galbraith <efault@gmx.de>2010-03-11 17:16:20 +0100
committerIngo Molnar <mingo@elte.hu>2010-03-11 18:32:50 +0100
commita64692a3afd85fe048551ab89142fd5ca99a0dbd (patch)
tree7d2800efb7fb9e3aa5c99ab883004932fdc362c6 /kernel/sched_fair.c
parente12f31d3e5d36328c7fbd0fce40a95e70b59152c (diff)
sched: Cleanup/optimize clock updates
Now that we no longer depend on the clock being updated prior to enqueueing on migratory wakeup, we can clean up a bit, placing calls to update_rq_clock() exactly where they are needed, ie on enqueue, dequeue and schedule events. In the case of a freshly enqueued task immediately preempting, we can skip the update during preemption, as the clock was just updated by the enqueue event. We also save an unneeded call during a migratory wakeup by not updating the previous runqueue, where update_curr() won't be invoked. Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1268301199.6785.32.camel@marge.simson.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_fair.c')
-rw-r--r--kernel/sched_fair.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index c3b69d4b5d6..69e582020ff 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -3064,8 +3064,6 @@ static void active_load_balance(struct rq *busiest_rq, int busiest_cpu)
/* move a task from busiest_rq to target_rq */
double_lock_balance(busiest_rq, target_rq);
- update_rq_clock(busiest_rq);
- update_rq_clock(target_rq);
/* Search for an sd spanning us and the target CPU. */
for_each_domain(target_cpu, sd) {